Mojo C++ bindings: extract code shared by different variants.

mojo/public/tools/bindings/generators/cpp_templates/enum_macros.tmpl

 {#---
   Macro for enum definition, and the declaration of associated functions.
 ---#}
+
 {%- macro enum_decl(enum) %}
-enum class {{enum.name}} : int32_t {
-{%- for field in enum.fields %}
-{%-    if field.value %}
+{%-   set enum_name = enum|get_name_for_kind(flatten_nested_kind=True) %}

[Ken Rockot(use gerrit already), 2016/08/17 15:10:55]

clever solution :)

+enum class {{enum_name}} : int32_t {
+{%-   for field in enum.fields %}
+{%-     if field.value %}
   {{field.name}} = {{field.value|expression_to_text}},
-{%-    else %}
+{%-     else %}
   {{field.name}},
-{%-    endif %}
-{%- endfor %}
+{%-     endif %}
+{%-   endfor %}
 };
+
+inline std::ostream& operator<<(std::ostream& os, {{enum_name}} value) {
+  switch(value) {
+{%-   for _, values in enum.fields|groupby('numeric_value') %}
+    case {{enum_name}}::{{values[0].name}}:
+      return os << "{{enum_name}}::
+{%-     if values|length > 1 -%}
+      {{'{'}}
+{%-     endif -%}
+      {{values|map(attribute='name')|join(', ')}}
+{%-     if values|length > 1 -%}
+      {{'}'}}
+{%-     endif -%}
+      ";
+{%-   endfor %}
+    default:
+      return os << "Unknown {{enum_name}} value: " << static_cast<int32_t>(value);
+  }
+}
+
+{#-   Returns true if the given enum value exists in this version of enum. #}
+inline bool IsKnownEnumValue({{enum_name}} value) {
+  return {{enum|get_name_for_kind(internal=True,
+                                  flatten_nested_kind=True)}}::IsKnownValue(
+      static_cast<int32_t>(value));
+}
 {%- endmacro %}
 
 {%- macro enum_data_decl(enum) %}
-struct {{enum.name}}_Data {
+{%-   set enum_name = enum|get_name_for_kind(flatten_nested_kind=True) %}
+struct {{enum_name}}_Data {
  public:
   static bool const kIsExtensible = {% if enum.extensible %}true{% else %}false{% endif %};
 
   static bool IsKnownValue(int32_t value) {
 {%- if enum.fields %}
     switch (value) {
 {%-   for enum_field in enum.fields|groupby('numeric_value') %}
       case {{enum_field[0]}}:
 {%-   endfor %}
         return true;
     }
 {%- endif %}
     return false;
   }
 
   static bool Validate(int32_t value,
                        mojo::internal::ValidationContext* validation_context) {
     if (kIsExtensible || IsKnownValue(value))
       return true;
 
     ReportValidationError(validation_context,
                           mojo::internal::VALIDATION_ERROR_UNKNOWN_ENUM_VALUE);
     return false;
   }
 };
 {%- endmacro %}
 
-{#--- macros for enum-associated functions. Namely:
-  * operator<<(): outputs the given enum value.
-  * IsKnownEnumValue(): returns true if the given enum value exists in this
-        generated version of enum.
----#}
-
-{%- macro enum_stream_operator(enum) %}
-inline std::ostream& operator<<(std::ostream& os, {{enum|get_name_for_kind}} value) {
-  switch(value) {
-{%- for _, values in enum.fields|groupby('numeric_value') %}
-    case {{enum|get_name_for_kind}}::{{values[0].name}}:
-      return os << "{{enum|get_name_for_kind}}::
-{%-   if values|length > 1 -%}
-      {{'{'}}
-{%-   endif -%}
-      {{values|map(attribute='name')|join(', ')}}
-{%-   if values|length > 1 -%}
-      {{'}'}}
-{%-   endif -%}
-      ";
-{%- endfor %}
-    default:
-      return os << "Unknown {{enum|get_name_for_kind}} value: " << static_cast<int32_t>(value);
-  }
-}
+{%- macro enum_hash(enum) %}
+{%-   set enum_name = enum|get_qualified_name_for_kind(
+          flatten_nested_kind=True) %}
+template <>
+struct hash<{{enum_name}}>
+    : public mojo::internal::EnumHashImpl<{{enum_name}}> {};
 {%- endmacro %}
-
-{%- macro is_known_enum_value(enum) %}
-inline bool IsKnownEnumValue({{enum|get_name_for_kind}} value) {
-  return {{enum|get_qualified_name_for_kind(internal=True)}}::IsKnownValue(
-      static_cast<int32_t>(value));
-}
-{%- endmacro %}
-
-{%- macro enum_hash(enum) %}
-template <>
-struct hash<{{enum|get_qualified_name_for_kind}}>
-    : public mojo::internal::EnumHashImpl<{{enum|get_qualified_name_for_kind}}> {};
-{%- endmacro %}